EP1220028A1 - Verfahren zur Kontrolle der Breite von Polyesterträgern - Google Patents

Verfahren zur Kontrolle der Breite von Polyesterträgern Download PDF

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Publication number
EP1220028A1
EP1220028A1 EP01205192A EP01205192A EP1220028A1 EP 1220028 A1 EP1220028 A1 EP 1220028A1 EP 01205192 A EP01205192 A EP 01205192A EP 01205192 A EP01205192 A EP 01205192A EP 1220028 A1 EP1220028 A1 EP 1220028A1
Authority
EP
European Patent Office
Prior art keywords
polyester
polyester sheet
stretching
drafter
width
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01205192A
Other languages
English (en)
French (fr)
Inventor
Wen-Li A Chen
Timothy F. Cilano
Larry K. Maier
Jeffrey P Johnson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US09/751,117 external-priority patent/US6623679B2/en
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP1220028A1 publication Critical patent/EP1220028A1/de
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
    • B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/20—Edge clamps
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
    • G03C1/795—Photosensitive materials characterised by the base or auxiliary layers the base being of macromolecular substances
    • G03C1/7954—Polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C2200/00—Details
    • G03C2200/43—Process

Definitions

  • the present invention relates in general to the manufacture of imaging films and elements and in particular to a novel method of controlling necking-in of a polyester film during machine direction stretching in a biaxial orientation process.
  • polyester photographic film supports typically involve biaxially orienting a cast amorphous sheet. Such orientation processes and subsequent heat setting significantly improve the flexibility, tensile strength, dimensional stability of materials such as Polyethylene Terephthalate (PET) and Polyethylene Naphthalate (PEN) and thus renders them usable as photographic film supports.
  • PET Polyethylene Terephthalate
  • PEN Polyethylene Naphthalate
  • Another alternative would be to slit some portion of the MD stretched sheet before entering the TD stretch. However, this would incur excess edge-trim waste and cause robustness issues caused by slitting a film while it is still mostly amorphous and much thicker than the final film thickness for photographic film supports. These are both undesirable alternatives.
  • the present invention discloses a process to manufacture biaxially oriented imaging polyester film supports by allowing the edges to "neck in” during the longitudinal or machine direction stretch in a controlled manner to minimize edging waste and to minimize edge effects.
  • neck-in means reduction in width of a cast sheet when conducting machine direction (MD) orientation.
  • the present invention takes advantage of the natural neck-in tendency of a thermoplastic material upon stretching in the machine direction. That is, with use of the present invention, the width of a MD stretched sheet is reduced in a controlled manner by a desired amount such that no edge trim is necessary.
  • the present invention thus addresses the needs related to a MD orientation process where the film width leaving the process can be controlled to eliminate edge trimming after MD orientation, reduce or eliminate edge orientation effects, avoid large capital expenditures to the film line while maintaining the ability to manufacture different types of polyester film supports, such as PET and PEN, alternatively on the same film line.
  • a beaded drafter modified by having extended rollers (14) installed to narrow the width of a polyester sheet during the machine stretch as it passes along the drafter.
  • Figure 1 shows a cross-sectional view of a beaded cast sheet constrained by a pair of bearing rollers on each side of the edge.
  • Figure 2 is a top view and edge view of a beaded drafter process.
  • Figure 2a is a section view looking from the web side.
  • Figure 2b is a top view of the bead drafter.
  • Figure 2c is a section view looking from the bead side.
  • the present invention involves modifying the machine direction stretching of a conventional sequential stretching machine using a beaded drafter. Specifically, this invention addresses the needs to make PEN film on an existing PET biaxial stretching machine that has limited tenter width.
  • the machine of the invention is modified to accommodate the high stretch ratio required for making PEN film.
  • PEN is described in U.S. Patent No.5,759,756 which is incorporated herein in its entirety.
  • the present invention requires a hardware modification of a beaded drafter section (18).
  • a pair of extended edge rollers ( 14 ) were installed in the drafter at the point where stretching occurs ( 16).
  • extended roller(s) means rollers that have been mounted on an extension bar which move the rollers position inward by a predetermined neck-in amount.
  • Each pair consists of top ( 2 ) and bottom rollers ( 4 ) that hinge the edge bead (6 ) from further necking in once it hits the rollers.
  • the gap between the top and bottom rollers ( 10 ) can be mechanically adjusted for different cast sheet thicknesses ( 12) .
  • the amount of neck-in is determined by the distance between the existing edge rollers and the extended rollers (14 ) . This can be altered by having a number of sets of extended roller blocks that can be easily mounted on the drafter section. The amount of neck-in also depends on the polymer being processed since different polyesters require different stretch ratios.
  • PET film can be made at a stretch ratio between 3 to 4X.
  • the stretch ratio is preferably set higher than 4X due to its higher strain hardening point, mentioned in U.S. Patent No.5,759,756.
  • a 15% edge trim on each side of a drafted, or machine direction oriented, sheet is slit off prior to tentering. This provides a direct comparison (that is, same width entering the tenter) with current invention. One incurs in this case about 15% edge trim waste.
  • Samples were collected at each process condition for testing. Five lengthwise and five widthwide strips 150mm x 15mm were cut from each of the films as described above.
  • a Sintech tensile tester (available from Sintech Inc. 378 Page St., Stoughton, MA 02072) was used to measure representative tensile properties in accordance with ASTM D882. The properties measured (and the units in which they are reported in Table 1) are: tensile modulus (psi), yield stress (ksi) and break stress (ksi).
  • Example 1 3.95 4.0 9.3 9.6 42 30 Example 1 3.55 4.0 10.5 10.0 35 47 Example 2 3.55 4.1 10.5 9.9 36 45 Example 3 3.55 4.2 10.2 10.0 40 44 Example 4 3.75 4.1 10.7 9.6 34 53 Example 5 3.75 4.2 10.7 10.0 35 48 Example 6 3.95 4.1 10.7 9.9 31 51 Example 7 3.95 4.2 11.0 9.7 32 49 MD and TD Ratio Machine and Transverse Direction Stretch Ratio Tear Strength is normalized to 3.45 mils to compare samples made at different conditions.
  • polyester films In manufacturing polyester films, the primary properties of concern and are as shown in Table 1 -- tensile modulus and tear strength--although other physical properties such as break stress, yield stress, and break elongation are also recorded.
  • Examples 1 to 7 demonstrate that width reduction or width control can be achieved at various machine direction stretch ratios without sacrificing the physical properties of the film produced. By controlling the width of the film, as disclosed herein, there is less loss to edging waste.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
EP01205192A 2000-12-29 2001-12-17 Verfahren zur Kontrolle der Breite von Polyesterträgern Withdrawn EP1220028A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US751117 2000-12-29
US09/751,117 US6623679B2 (en) 2000-12-29 2000-12-29 Method of controlling width of polyester film support
US09/854,776 US20020132196A1 (en) 2000-12-29 2001-05-14 Method of controlling width of polyester film support
US854776 2001-05-14

Publications (1)

Publication Number Publication Date
EP1220028A1 true EP1220028A1 (de) 2002-07-03

Family

ID=27115372

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01205192A Withdrawn EP1220028A1 (de) 2000-12-29 2001-12-17 Verfahren zur Kontrolle der Breite von Polyesterträgern

Country Status (3)

Country Link
US (1) US20020132196A1 (de)
EP (1) EP1220028A1 (de)
JP (1) JP2002225125A (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3908690A1 (de) * 1988-05-04 1989-11-16 Skc Ltd Verfahren zur herstellung einer biaxial verstreckten poly-(epsilon)-caproamid-folie
US5824394A (en) * 1994-06-20 1998-10-20 Diafoil Hoechst Company, Limited Biaxially oriented laminated polyester film
EP1038653A2 (de) * 1999-03-19 2000-09-27 Fuji Photo Film Co., Ltd. Verfahren zur Herstellung einer biaxial gestreckten Polyesterfolie

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978740A (en) * 1959-04-29 1961-04-11 Olin Mathieson Web stretching method and apparatus
US3432894A (en) * 1967-12-19 1969-03-18 Joh Sons Kleinewerfers Fabric stretching device
US3833973A (en) * 1972-06-16 1974-09-10 Kimberly Clark Co Simultaneous continuous biaxial web stretcher
US4050124A (en) * 1975-07-30 1977-09-27 Eastman Kodak Company Web stretching apparatus
US4384392A (en) * 1980-12-30 1983-05-24 Mobil Oil Corporation Apparatus for the biaxial orientation of a deformable sheet material
DE69123511T2 (de) * 1990-08-23 1997-04-03 Nippon Petrochemicals Co Ltd Streckmaschine
DE19520513C1 (de) * 1995-06-03 1996-07-25 Kuesters Zittauer Maschf Gmbh Breitstreckaggregat

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3908690A1 (de) * 1988-05-04 1989-11-16 Skc Ltd Verfahren zur herstellung einer biaxial verstreckten poly-(epsilon)-caproamid-folie
US5824394A (en) * 1994-06-20 1998-10-20 Diafoil Hoechst Company, Limited Biaxially oriented laminated polyester film
EP1038653A2 (de) * 1999-03-19 2000-09-27 Fuji Photo Film Co., Ltd. Verfahren zur Herstellung einer biaxial gestreckten Polyesterfolie

Also Published As

Publication number Publication date
JP2002225125A (ja) 2002-08-14
US20020132196A1 (en) 2002-09-19

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